ISA 430 MkII

Specifications

We always quote 'real world' performance figures (measured to the AES17 standard). Some companies choose to quote chipset performance, which is misleading, and here's why.

Line

  • Gain Range: +10dB to +40dB continuously variable
  • Input Impedance: >1M Ohm

Mic

  • Gain Range: 0 to +60dB in 10dB steps
  • Input Impedance: Variable as follows: 600 Ohm, 1k4 Ohm, 2k4 Ohm, 6k8 Ohm
  • EIN: -128dB with 150 Ohm terminating impedance at 60dB of gain
  • Noise: -97dBu
  • THD: 0.001% with -20dBu 1kHz input and 20Hz?22kHz bandpass filter

Compressor (VCA mode)

  • Threshold Range: -28dB to +12dB
  • Ratio: 1.5:1 to 10:1
  • Slope: Soft knee
  • Attack: 100µs to 100ms
  • Release: 100ms to 7s, variable or auto (program dependent)

Compressor (Vintage Opto mode)

  • Threshold Range: -28dB to +12dB
  • Ratio: 1.5:1 to 5:1 in Comp mode, 5:1 to 20:1 in Lim mode
  • Slope: Soft knee in Comp mode, Hard knee in Lim mode
  • Attack: Fixed
  • Release: Fixed

EQ

  • Low Pass Filter: 18dB/oct from 400Hz to 22kHz
  • High Pass Filter: 18dB/oct from 20Hz to 1k6Hz
  • Parametric section is comprised of: Low-mid & Hi-mid parametric, each with continuously variable boost/cut with centre detent, frequency sweep control with two ranges, and fully variable Q. Low-mid frequencies 40Hz to 400Hz (120Hz to 1k2Hz when x3 is pressed). Hi-mid frequencies 600Hz to 6kHz (1k8Hz to 18kHz when x3 is pressed)
  • Shelving section is comprised of: High Frequency Shelf: The frequency range steps are 1.5kHz, 3.3kHz, 6.8kHz and 15kHz (2.2kHz, 4.7kHz, 10kHz and 18kHz when Hi Range is engaged). Low Frequency Shelf: The frequency range steps are 20Hz, 56Hz, 160Hz and 460Hz (33Hz, 95Hz, 270Hz and 655Hz when Hi Range switch is engaged)

Gate

  • Threshold Range: -40dB to +10dB
  • Gate Range: 0 to -80dB
  • Attack: switched fast or slow
  • Release: 100ms to 5s
  • Hold: 20ms to 4s
  • Expander Ratio: 0 to 5:1

De-Esser

  • Threshold Range: 22dB
  • Frequency Range: 2k2 to 9k2
  • Ratio at centre frequency: 2:1

Limiter

  • Threshold Range: 20dBu
  • Ratio: infinite (Brick Wall)
  • Attack: Frequency dependent

Weight

  • 7.58kg
  • 16.7Ibs

Dimensions

  • 484mm (W) x 85mm (H) x 250mm (D)
  • 19" (W) x 3.5" (H) x 9.8" (D)

Optional A-D Converter Specifications

Output formats (All channels)

  • AES/EBU (5V / 110 ohms), S/PDIF (0.8V / 75 ohms)
  • ADAT lightpipe (SMUX I/II/IV)
  • S/PDIF lightpipe

Bit depth

  • 24 bits

AES3 output jitter

  •  <:500ps, 50Hz-100kHz
  •  <:400ps, 700Hz-100kHz

Frequency response 

  •  All ranges: 20Hz–20kHz ± 0.3dB (50Hz–16kHz ± 0.1dB)
  •  176.4kHz, 192kHz : 16Hz–55kHz ± 0.5dB

THD+n 

  •  –117.5dB A-weighted, audio band-limited, 1kHz, -60dB FS input
  •  Maximum 0.004% at –1dB FS (1kHz)
  •  Minimum 0.0008% at –13dB FS (1kHz)

Idle channel noise

  •  113.5dB at 44.1kHz, CCIR-weighted, full bandwidth

Crosstalk 

  •  –109dB at 12kHz